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1 Introduction
This document provides guidance on how to use the GHX-10 device. It explains the front panel,
the infrared remote control, and the Doremi Universal Interface usage. It also details how to
upgrade the firmware on the GHX-10.
1.1 Contact Information
If in need of help or assistance, please contact Doremi Labs Technical Services at
+ 1-818-562-1101 or email at proavsupport@doremilabs.com.
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2 GHX-10 Overview
2.1 GHX-10 Description
The GHX-10 is a Universal Cross Converter that incorporates High-Definition Multimedia
Interface technology, and SDI connectors that allow for any input to be converted to any output
format or scan rate. It supports both SD and HD video and employs high quality 12 bit bi-cubic
interpolation to ensure the highest quality picture. The GHX-10 can tackle many conversion
tasks. It can be used as a computer DVI to HD-SDI converter (using a DVI to HDMI® adapter
cable), HDMI resolution converter, or as an HD video up-converter or down-converter. It
supports up to 8 channels of AES, HDMI and SDI audio. A two lines LCD display and scroll
wheel simplify navigation through the GHX-10's menus.
2.1.1 GHX-10 Front Panel
This is a snap shot of the front panel:
Menu WheelSignal LEDs
SD Card
An LCD screen is available in the middle of the front panel to facilitate controlling the GHX-10
without using the On Screen Display.
The scroll wheel with built in Select button and the ESC button can be used to navigate the
menu structure and setup the unit.
The four LED indicators reflect the status of the various input signals:
•SDI-A LED
•SDI-B LED
•HDMI LED
•SYNC LED
The “PWR” LED lights up when the GHX-10 is powered ON.
The infra-red sensor can be used to remotely control of the GHX-10, see Section 4.
A SD Memory connector is available and can be used to perform firmware update.
Escape Button
Figure 1: GHX-10 Front View
Infrared Sensor
Power LED
Power Switch
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2.1.2 GHX-10 Rear Panel
Below is a snap shot of the GHX-10 rear panel:
Power
USB
HDMI
out
HDMI
in
SDI-B
out
SDI-BinSDI-A
SDI-A
Figure 2: GHX-10 Rear Panel
The rear panel has the following connectors:
ConnectorDescription
USBUSB connector
HDMI inHDMI input connector
HDMI outHDMI output connector
out
in
SYNC
out
SYNC
in
AES-12
out
AES-12
in
AES-34
out
AES-34
in
AES-56
out
AES-56
in
AES-78
out
AES-78
in
SDI-A outSDI output connector – Link A
SDI-B outSDI output connector – Link B
SDI-A inSDI input connector – Link A
SDI-B inSDI input connector – Link B
SYNC inSync input connector
SYNC outSync output connector
AES-12 inAES audio input connector for audio tracks 1 and 2
AES-12 outAES audio output connector for audio tracks 1 and 2
AES-34 inAES audio input connector for audio tracks 3 and 4
AES-34 outAES audio output connector for audio tracks 3 and 4
AES-56 inAES audio input connector for audio tracks 5 and 6
AES-56 outAES audio output connector for audio tracks 5 and 6
AES-78 inAES audio input connector for audio tracks 7 and 8
AES-78 outAES audio output connector for audio tracks 7 and 8
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2.2 Supported Formats
The table below summarizes all supported inputs and outputs available on the GHX-10.
Supported Input(s)Supported Output(s)
SD-SDI: NTSC, PAL
HD-SDI: all HD +2K formats (SMPTE
274, SMPTE296, SMPTE372)
HDMI/DVI:
640x480 = VGA
720x480i = 480i
720x480p = 480p
1440x480i = 480i
720x576i = 576i
720x576p = 576p
1440x576i = 576i
800x600 = SVGA
1280x720 = 720p
1024x768 = XGA
1280x768 = WXGA
1364x768 = WXGA
1366x768 = WXGA
1536x768 = 1536x768
1152x864 = XGA+
1280x960 = SXGA-
SD-SDI: NTSC, PAL
HD-SDI: all HD +2K formats (SMPTE
274, SMPTE296, SMPTE372)
HDMI/DVI:
640x480 = VGA
720x480i = 480i
720x480p = 480p
720x576i = 576i
720x576p = 576p
800x600 = SVGA
1280x720 = 720p
1024x768 = XGA
1366x768 = WXGA
1280x1024 = SXGA
1400x1050 = SXGA+
1680x1050 = WSXGA+
1920x1080i = 1080i
1920x1080p = 1080p
1920x1200 = WUXGA
1280x1024 = SXGA
1364x1024 = 1364x1024
1400x1050 = SXGA+
1680x1050 = WSXGA+
1920x1080i = 1080i
1920x1080p = 1080p
2048x1080 = 2Kp
1600x1200 = UXGA
1920x1200 = WUXGA
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3 GHX-10 Front Panel Controller
Throughout this chapter “press Select” refers to pressing the front panel scroll wheel button of
the GHX-10 – see Figure 1.
3.1 Menu Items Overview
Press “Select” to enter the GHX-10 menu system then turn the “Wheel” to access the different
menus:
•Input
•Output
•Image
•Sync
•Audio
•OSD
•System
•Status
Press “Select” to navigate one of the above menu items and access the list of available submenus. Browse the list of available sub-menus by turning the “Wheel”, then press “Select” to
change settings of a given sub-menu.
Browse the available values by turning the “Wheel”. To choose the desired value, press
“Select”. The selected value should be flagged with the # sign on its right which is the current
setting indicator.
To go back to a higher level in this menu tree, press on the “ESC” button – Keep pressing it to
exit the menu system.
The following tables list all GHX-10 setup parameters, items in bold are factory defaults. All
video formats show frame rates and not the field rates, so 1080i-60 fields per second will be
shown as 1080i-30 frames per second.
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3.2 Input Menu
This menu can be used to setup the input parameters.
Sub-MenuValueDescription
InterfaceSDI
HDMI/DVI
Pattern
SDI ColorAuto
RGB
RGB ext
YCbCr 601
YCbCr 601 ext
YCbCr 709
YCbCr 709 ext
XYZ’
YCxCz'
HDMI/DVI colorAuto
RGB
RGB ext
YCbCr 601
YCbCr 601 ext
YCbCr 709
YCbCr 709 ext
Input interface setting.
Pattern produces a color pattern
with 16 channels of audio at
different frequencies
SDI input color setting.
Auto: Single Link (1.5Gbps) inputs
will be treated as 601 (SD) or 709
(HD). Dual link (1.5Gbps) inputs
will be treated as RGB.
Ext: designates extended color
range (full bandwidth) as opposed
to limiting the color spectrum to
comply with ITU standards.
HDMI/DVI input color setting
Auto: Detected using meta-data, if
not present the default is RGB
Ext: designates extended color
range (full bandwidth) as opposed
to limiting the color spectrum to
comply with ITU standards.
Default EDID720p 50
720p 60
1080i 25
1080i 30
1080p 50
1080p 60
WUXGA 50
WUXGA 60
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DVI input default setting.
When you feed a signal to the
HDMI input, the GHX-10 has to
report a native resolution over
EDID. This menu allows the user
to change the default resolution of
the GHX-10 between the
available formats.
CAUTION: You must disconnect
HDMI/DVI source before
changing this setting.
3.3 Output Menu
This menu can be used to setup the output parameters.
Sub-MenuValueDescription
InterfaceHDMI/DVI
SDI
SDI colorAuto
RGB
RGB ext
YCbCr 601
YCbCr 601 ext
YCbCr 709
YCbCr 709 ext
XYZ’
SDI ResolutionNTSC
PAL
720p
1080i/sf
1080p
2Kp
2Kp Flat
Match Input
Set the active output. For common
video formats, both outputs can be
active simultaneously
Set the SDI output color mode
Auto: 601 (SD) 709 (HD), RGB
(2K)
“ext” designates extended color
range (full bandwidth) as opposed
to limiting the color spectrum to
comply with ITU standards.
Set the SDI output pixel resolution.
Match Input: In this mode, the SDI
output will have the same
resolution as the input source.
SDI Frequency23.98
24
25
29.97
30
47.95 (1080p only)
48 (1080p only)
50 (720p & 1080p only)
59.94 (720p & 1080p
only)
60 (720p & 1080p only)
Match input
SDI Force InterlOff
On
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Set the SDI output frame rate
Match Input: In this mode, the SDI
output frame rate will be equivalent
to the input source
Force the SDI output to interlaced
(or Segmented Frame)
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